3-Pieces Crystal Radio 223p Variable Capacitor Printed Circuit Boards PCB-3D For Sale
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3-Pieces Crystal Radio 223p Variable Capacitor Printed Circuit Boards PCB-3D :
(3) Crystal Radio 223p Duplex Variable Capacitor Mounting Printed Circuit (PC) Boardsfor Crystal Radio applications and other Radio ProjectsThis sale is For 3pcs. Bare Circuit Boards- No other Parts includedOne of the Pictures in the Gallery show a Circuit Board with Components Mounted for Pictorial Purposes- Only 3 Bare Circuit Boards are included in this saleNO KNOB OR CAPACITOR IS INCLUDED
MultilayerPCB 50mm Diameter, 1.6mm ThickNewly Manufactured Circuit BoardCapacitor Mounting Holes Line up perfectly with the 223p capacitorTwo 3mm holes are also in the PC Board for Mounting the PC Board to your project. (See Picture Gallery)
If you have ever struggled Mounting a 223p Capacitor like I have, this is the ideal solution for any of your DIY Radio Projects. The Circuit board can accommodatemounting the capacitor using the capacitor mounting holes. The capacitorsolder terminals can be directly soldered to the Circuit board and then connected to your circuit using direct connection with using your own wires from the circuit board.Sincea 223p capacitor is a Dual Capacitor, this circuit board up for sale has an integral connection such that both of the capacitors of a 223p are wired in Parallelto increase the Capacitance Range to as muchas 35pF to 235pF.
Here are some facts regarding a 223p Duplex CapacitorCapacitance increases with anti-clockwise movement. This variable capacitor is ideal for use in radio circuits such as crystal sets.A 223p capacitor has two separate variable capacitors inside which can be connected in parallel to form one single capacitor of higher value. The middle connection strip is the common ground connection. The two sections have maximum capacitances of 59.1 and 141.6pF and so form a total of 200pF. But the specific range can often vary by manufacturer and can be wider.I’ve measured some newer 223 Capacitors with capacitance range at around:Ca: 18pF to 160pFCo: 17pF to 75pFCombined in Parallel from 35pF to 235pF
There are also two trimmer capacitors on the back side internal to this variable capacitor which are used to add a fixed amount of capacitance when used insome designs.Minimum capacitance is when the top semi-circular plate attached to the screw is moved so that the lower static plate is completely exposed.
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